EP1689543B1 - Procede pour eliminer des residus de sable de moulage sur des pieces coulees et dispositif pour mettre en oeuvre ce procede - Google Patents

Procede pour eliminer des residus de sable de moulage sur des pieces coulees et dispositif pour mettre en oeuvre ce procede Download PDF

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Publication number
EP1689543B1
EP1689543B1 EP04802757A EP04802757A EP1689543B1 EP 1689543 B1 EP1689543 B1 EP 1689543B1 EP 04802757 A EP04802757 A EP 04802757A EP 04802757 A EP04802757 A EP 04802757A EP 1689543 B1 EP1689543 B1 EP 1689543B1
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EP
European Patent Office
Prior art keywords
drum
cast parts
bulk material
molding sand
bed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP04802757A
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German (de)
English (en)
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EP1689543A2 (fr
Inventor
Dieter Johnen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Elino Industrie-Ofenbau Carl Hanf & Co GmbH
Original Assignee
Elino Industrie-Ofenbau Carl Hanf & Co GmbH
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Filing date
Publication date
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Publication of EP1689543A2 publication Critical patent/EP1689543A2/fr
Application granted granted Critical
Publication of EP1689543B1 publication Critical patent/EP1689543B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D31/00—Cutting-off surplus material, e.g. gates; Cleaning and working on castings
    • B22D31/002—Cleaning, working on castings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
    • B22D29/001—Removing cores
    • B22D29/006—Removing cores by abrasive, water or air blasting

Definitions

  • the present invention relates to a method for ridding castings of G fauxsandresten, in particular sand cores.
  • the castings are continuously moved through a furnace chamber in which there is a heated gas atmosphere.
  • the binders which bind together the sand cores are burned out and the castings are freed from the sand adhering thereto.
  • the dissolved sand is collected in the lower part of the furnace chamber, removed from the furnace and regenerated.
  • the present invention has for its object to provide a method of the type specified, which is particularly quick and easy to carry out.
  • the method according to the invention is based on the idea of applying cast iron residues to castings containing heated loose bulk material by throwing it down from the upper area of the interior of the drum onto the castings to thereby break up the adhering cast sand residues and burn off the casting.
  • the bulk material used for discarding is preferably high-temperature and has for example a temperature of 500 ° C or more.
  • the same material as it adheres to the casting ie the same casting sand.
  • a separation of the throwing material from the detached casting sand is not required, which would be the case if another particulate material were used as the throwing material, for example other sand particles and the like.
  • the foundry sand used as throwing material mixes with the detached foundry sand residues in the lower region of the drum, and due to the rotation of the drum, this mixed casting sand material is again conveyed to the upper drum region and thrown off there again. In this way, a permanent loading of the castings by dropped casting sand takes place during their movement through the drum.
  • the method according to the invention finds another material, such as metallic or ceramic solids, as the bulk material used as the casting sand adhering to the castings use.
  • the invention further includes embodiments in which mixtures of the same foundry sand and other bulk materials are used.
  • an embodiment is particularly preferred in which a G confusesandbett finds application, in which ceramic or metallic solids are included. Glass particles can also be used alone or mixed with foundry sand.
  • the casting sand is separated from these other materials, for example sieved, and removed from the drum while the other throwing material remains in the drum.
  • the casting sand In mixtures of other bulk material and foundry sand, only a portion of the casting sand, which is increasingly obtained by the passage of the castings through the drum, separated and removed from the drum.
  • any bulk material can thus be used as a throwing material, which has the required hardness and whose abrasion is not too large.
  • any shapes can be used (round shapes, angular shapes) as long as the purpose according to the invention is achieved. The most suitable forms are to be determined empirically.
  • the drum wall is heated to maintain the bed of bulk material disposed within the drum at a substantially constant high temperature.
  • the introduction of the castings in the drum located in this bulk material bed is heated before the start of the process, so that already at the introduction of the first casting a correspondingly high-temperature material bed is present.
  • the castings themselves can be introduced into the drum in the temperature condition in which they leave the casting plant.
  • the interior atmosphere of the drum is determined in relation to the treatment of the castings. For example, when the castings leaving the foundry plant are to be annealed, the atmosphere in the drum is adjusted for its composition or temperature so that this annealing process can be performed.
  • the cleaned castings led out of the drum are subjected to a further cleaning process by blowing off in order to remove even the last adhering sand particles.
  • the castings are continuously passed through the drum.
  • the method according to the invention can be carried out particularly quickly and easily.
  • this does not exclude that a discontinuous promotion of castings (stepwise, intermittently, etc.) is possible.
  • an introduction in the drum at one longitudinal end a promotion by the drum and a design at the opposite longitudinal end is preferred.
  • this should not exclude that a feed and removal at the same longitudinal end of the drum (so-called retort oven) is performed.
  • retort oven a feed and removal at the same longitudinal end of the drum
  • the promotion of castings within the drum can be horizontal or inclined.
  • the delivery can be centric or eccentric.
  • the castings can also be pivoted or rotated, in the drum rotation direction or in opposite directions to the drum rotation direction in order to achieve the most uniform possible loading of the casting with the dropped casting sand.
  • places of the casting are exposed to the discarded bulk material that would not be hit by the bulk material without turning or pivoting.
  • a heat treatment of the castings which is expediently carried out immediately after the process according to the invention can be carried out by utilizing the sensible heat of the castings and has a significantly improved uniformity and thus quality with an equally considerably shortened duration.
  • the present invention further relates to an apparatus for carrying out the method described above, which comprises a furnace system.
  • the furnace system comprises a rotating heated drum, the inside of which is provided with conveying elements which promote the bulk material from the bed of bulk material along the wall of the drum upwards and cast onto the castings.
  • These conveying elements are preferably designed as blades.
  • the conveying elements are preferably arranged at a distance along the inner circumference of the drum. As the drum rotates, it passes through the bulk material bed located in the lower area of the drum interior, thereby conveying a portion of the bulk material along the drum wall to the upper drum area, from where the bulk material is dropped onto the castings below.
  • the preferably high-temperature bulk material reaches the G fauxsandreste adhering to the castings (sand cores), whereby they are broken by the burning out of the binder and released from the castings. It thus finds a combination of mechanical and thermal action for removing the G fauxsandreste application.
  • the drum forms part of a drum or rotary kiln oven.
  • the drum furnace is fed with the castings at one end of the oven and the removal at the opposite end of the oven.
  • a rotary oven has a closed end, while at the other end of the feed and removal take place.
  • drum it is always uniformly referred to as "drum", although it is meant both the rotary element of a drum furnace and that of a retort oven.
  • the drum is indirectly heated, i. a direct heating inside the drum does not take place, but it is the drum wall heated from the outside.
  • an additional heating may be provided for direct heating.
  • Such drum ovens or rotary oven ovens with indirect heating are known and need not be described in detail at this point.
  • the indirect heating can be done for example by heating with gas, oil, in an electrical manner, in an inductive manner, by microwaves, etc.
  • the castings to be liberated from the G cardssandresten be moved by means of a product carrier through the drum or in the drum.
  • a product carrier may be formed, for example, as slideway, vibrating table, Hubbalkensystem, chain-like flow system, etc. It is essential that the castings can be contacted by the discharged bulk material largely free, without being hindered by the product carrier.
  • the product carrier used can be designed to be pivotable or rotatable, so that the castings arranged on or in the product carrier can be pivoted or rotated during their movement within the drum in order to achieve a substantially uniform application of the bulk material.
  • the furnace system is preferably designed as a continuous system, but may also be configured as a rotary kiln-fired furnace. In this case, the movement of the castings takes place in the forward and backward direction.
  • the product carrier can also be designed as a conveyor belt, or the product carrier can be arranged on a conveying device, for example a conveyor belt.
  • the furnace system preferably has on the inlet and outlet side suitable locks to allow introduction and execution of the castings, without the furnace atmosphere penetrates to the outside or penetrates the ambient atmosphere in the oven.
  • suitable locks are known and need not be described in detail here.
  • baffle plates To determine the height of the bulk material bed inside the drum are preferably used baffle plates. These may be formed spirally and run around the inner circumference of the drum, so that they can serve for filling or emptying of the drum when reversing the direction of rotation.
  • the excess G hasslesandmenge is discharged from the drum in a suitable form completed atmospherically. It can then be sent to a conventional core sand regeneration to allow reuse in the caster.
  • FIG. 1 schematically shown drum furnace has a rotating drum 1, which is rotatably mounted within a suitable storage rack, which is schematically indicated at 2.
  • a suitable storage rack which is schematically indicated at 2.
  • the rotatably mounted drum 1 is heated indirectly, ie from the outside over in FIG. 1 not shown heaters (for example, a suitable gas heater), so that the drum wall is heated.
  • heaters for example, a suitable gas heater
  • Inside the drum 1 is a suitable gas atmosphere, which is maintained almost unchanged in the interior of the drum due to the formation of inlet and outlet locks for the castings to be treated and the incoming and outgoing casting sand.
  • the respective locks for entry and execution of the castings and the G fauxsandes are in FIG. 1 not shown.
  • FIG. 1 also shows a product carrier 5 in the form of a cage in which a casting 6 to be treated is located.
  • the product carrier 5 rests on a conveyor belt 7 which feeds the product carrier into the drum, through the drum in the longitudinal direction thereof and out of the drum moved out again.
  • Such product carriers are also known.
  • the product carrier 5 in the clockwise direction of FIG. 1 pivot about the central longitudinal axis of the drum. During the movement of the product carrier 5 through the drum, there is thus a pivoting of the casting 6 arranged in the product carrier 5.
  • a G mansandbett (bed of bulk material) 4 which is erected before the introduction of the first, with G mansandresten afflicted casting 6 in the drum there. While the casting 6 passes through the drum in the longitudinal direction, rotates the drum, wherein arranged on the inside of the drum wall conveying elements 3 in the form of blades the casting sand from the bed 4 in FIG. 1 promote counterclockwise in the upper region of the interior of the drum and upon reaching this upper portion of the underlying casting 6, which is fixed in the cage-shaped product carrier 5 drop.
  • the G mansandbett 4 Due to the indirect heating of the drum wall, the G mansandbett 4 has been brought to a correspondingly high temperature, for example, about 500 ° C, so that the G mansandresten afflicted casting 6 is now applied from above with hot loose casting sand. Due to the impact of the hot G fauxsandes on the adhering G fauxsandreste (cores) (abrasive effect) and the associated thermal contact the G toysandanhaftept are broken by burning out the possibly still existing binder dissolved from the casting and destroyed, so that the formerly solid masses as loose Collect foundry sand in the lower area of the rotating drum and enlarge the existing cast sand bed 4. To keep the height of the bed 4 approximately constant, excess foundry sand becomes permanent removed from the drum.
  • cores adhering G fauxsandreste
  • excess foundry sand becomes permanent removed from the drum.
  • FIG. 2 shows a schematic longitudinal section through the drum furnace of FIG. 1 , wherein drum 1 and storage rack 2 are shown purely schematically.
  • entry lock 9 to be treated provided with G mansandanhaftungen castings 6, which are arranged within the cage-shaped product carrier 5, via the conveyor belt 7 in the interior of the drum 1, are continuously moved through the interior of the drum and pass through the schematically indicated exit lock 10 out of the drum again.
  • the formed G mansandbett is indicated in the lower part of the drum interior, is subtracted from the casting sand through an outlet 8.
  • the invention also includes an embodiment in which the actual drum does not rotate, but arranged in the drum frame, which is adjacent to the drum wall and carries the conveying elements (blades) for the bulk material. This achieves a corresponding effect.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Casting Devices For Molds (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Claims (24)

  1. Procédé de séparation des résidus de sable de moulage des pièces moulées (6), avec les étapes suivantes:
    a) introduction des pièces moulées (6) avec les résidus de sable de moulage adhérents, dans le tambour chauffant (1) d'un système d'étuve, rempli dans sa zone inférieure d'un lit (4) de matériau tout venant en vrac;
    b) amenée des pièces moulées à travers le tambour (1) à l'aide d'un support de produits (5) et rotation du tambour (1) et ainsi acheminement du matériau tout venant en vrac du lit (4) dans la zone de tambour supérieure et déversement de celui-ci sur les pièces moulées (6) pour détacher et détruire les résidus de sable de moulage adhérents;
    c) évacuation de la quantité de sable tombant en plus de la quantité de matériau tout venant initialement présente hors du tambour (1), et
    d) sortie des pièces moulées (6) nettoyées hors du tambour (1).
  2. Procédé selon la revendication 1, caractérisé en ce qu'on utilise comme matériau tout venant le même sable de moulage que celui qui adhère aux pièces moulées (6).
  3. Procédé selon la revendication 1, caractérisé en ce qu'on emploie comme matériau tout venant des corps solides métalliques ou céramiques.
  4. Procédé selon la revendication 1 ou 3, caractérisé en ce que le sable de moulage du matériau tout venant initial, est tamisé.
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce que le sable de moulage détaché des pièces moulées (6) est déversé avec le matériau tout venant initial sur les pièces moulées (6).
  6. Procédé selon l'une des revendications précédentes, caractérisé en ce que les parois du tambour sont chauffées.
  7. Procédé selon l'une des revendications précédentes, caractérisé en ce que le lit de matériau tout venant (4) dans le tambour (1) est chauffé avant l'introduction des pièces moulées (6).
  8. Procédé selon l'une des revendications précédentes, caractérisé en ce que les pièces moulées (6) sont introduites dans le tambour (1) à la température à laquelle elles ont quitté l'unité de moulage.
  9. Procédé selon l'une des revendications précédentes, caractérisé en ce que le matériau tout venant/la quantité de sable de moulage dans le tambour (1) reste essentiellement constante.
  10. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'atmosphère interne du tambour (1) est fixée en fonction du traitement des pièces moulées (6).
  11. Procédé selon l'une des revendications précédentes, caractérisé en ce que les pièces moulées nettoyées sortant du tambour (1) reçoivent un nettoyage final par sablage.
  12. Procédé selon l'une des revendications précédentes, caractérisé en ce que les pièces moulées (6) sont conduites en continu à travers le tambour (1).
  13. Procédé selon l'une des revendications précédentes, caractérisé en ce que le tambour (1) est chauffé de manière indirecte.
  14. Procédé selon l'une des revendications précédentes, caractérisé en ce que les pièces moulées (6) pendant leur mouvement dans le tambour (1) sont ballotées de-ci de-là ou, selon le cas, retournées par rotation.
  15. Dispositif d'exécution du procédé selon l'une des revendications précédentes avec un système d'étuve, caractérisé en ce que le système d'étuve présente un tambour (1) chauffant rotatif dont le côté intérieur est muni d'organes d'acheminement (3) qui transportent vers le haut le matériau tout venant du lit de matériau tout venant (4) le long des parois du tambour et qui le déversent sur les pièces moulées (6) amenées à l'aide d'un support de produits (5) à travers le tambour (1).
  16. Dispositif selon la revendication 15, caractérisé en ce que le tambour (1) fait partie d'une étuve à tambour ou à cornues rotatif.
  17. Dispositif selon l'une des revendications 15 ou 16, caractérisé en ce que le tambour (1) présente un dispositif de chauffage pour le chauffage indirect et facultativement un chauffage additionnel pour le chauffage direct.
  18. Dispositif selon l'une des revendications 15 à 17, caractérisé en ce que les organes d'acheminement (3) sont configurés comme des pales.
  19. Dispositif selon l'une des revendications 15 à 18, caractérisé en ce qu'il présente à l'intérieur du tambour (1) un support de produits (5) en grille ou en cage.
  20. Dispositif selon l'une des revendications 15 à 19, caractérisé en ce qu'il présente un support de produits (5) pouvant se déporter ou, selon le cas, rotatif.
  21. Dispositif selon l'une des revendications 15 à 20, caractérisé en ce que le système d'étuve est configuré comme une installation en continu.
  22. Dispositif selon l'une des revendications 15 à 21, caractérisé en ce que le système d'étuve présente des sas (9,10) côtés entrée et sortie.
  23. Dispositif selon l'une des revendications 15 à 22, caractérisé en ce que le tambour (1) présente des ralentisseurs à disques pour déterminer la hauteur du lit de matériau tout venant (4).
  24. Dispositif selon la revendication 23, caractérisé en ce que les ralentisseurs à disques sont de forme hélicoïdale et font des tours complets et lors d'une inversion du sens de marche du tambour (1) servent au remplissage ou, selon le cas, à la décharge.
EP04802757A 2003-11-21 2004-11-18 Procede pour eliminer des residus de sable de moulage sur des pieces coulees et dispositif pour mettre en oeuvre ce procede Not-in-force EP1689543B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10354493A DE10354493A1 (de) 2003-11-21 2003-11-21 Verfahren zum Befreien von Gußteilen von Gießsandresten und Vorrichtung zur Durchführung des Verfahrens
PCT/DE2004/002544 WO2005051573A2 (fr) 2003-11-21 2004-11-18 Procede pour eliminer des residus de sable de moulage sur des pieces coulees et dispositif pour mettre en oeuvre ce procede

Publications (2)

Publication Number Publication Date
EP1689543A2 EP1689543A2 (fr) 2006-08-16
EP1689543B1 true EP1689543B1 (fr) 2009-04-29

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EP04802757A Not-in-force EP1689543B1 (fr) 2003-11-21 2004-11-18 Procede pour eliminer des residus de sable de moulage sur des pieces coulees et dispositif pour mettre en oeuvre ce procede

Country Status (4)

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EP (1) EP1689543B1 (fr)
AT (1) ATE429990T1 (fr)
DE (2) DE10354493A1 (fr)
WO (1) WO2005051573A2 (fr)

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RU2456122C2 (ru) * 2009-05-20 2012-07-20 Федеральное государственное унитарное предприятие "Научно-производственный центр газотурбостроения "Салют" Установка выщелачивания барабанного типа ультразвуковая
RU2456123C2 (ru) * 2009-10-15 2012-07-20 Федеральное государственное унитарное предприятие "Научно-производственный центр газотурбостроения "Салют" Способ и устройство удаления керамического материала из отливок
ITUA20164053A1 (it) * 2016-06-01 2017-12-01 Fonderia Ghirlandina Spa Impianto di distaffatura di getti da fonderia

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NL7614082A (nl) * 1976-12-17 1978-06-20 Expert Nv Inrichting voor het koelen van gietstukken en het behandelen van vormzand.

Also Published As

Publication number Publication date
WO2005051573A2 (fr) 2005-06-09
DE10354493A1 (de) 2005-06-09
WO2005051573A3 (fr) 2005-11-17
EP1689543A2 (fr) 2006-08-16
ATE429990T1 (de) 2009-05-15
DE502004009434D1 (de) 2009-06-10

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